Deconvoluting Cr states in Cr-doped UO₂ nuclear fuels via bulk and single crystal spectroscopic studies.

ABSTRACT: Cr-doped UO₂ is a leading accident tolerant nuclear fuel where the complexity of Cr chemical states in the bulk material has prevented acquisition of an unequivocal understanding of the redox chemistry and mechanism for incorporation of Cr in the UO₂ matrix. To resolve this, we have used electron paramagnetic resonance, high energy resolution fluorescence detection X-ray absorption near energy structure and extended X-ray absorption fine structure spectroscopic measurements to examine Cr-doped UO₂ single crystal grains and bulk material. Ambient condition measurements of the single crystal grains, which have been mechanically extracted from bulk material, indicated Cr is incorporated substitutionally for U⁺⁴ in the fluorite lattice as Cr^+3</

SUBMITTER: Murphy GL 

PROVIDER: S-EPMC10147638 | biostudies-literature | 2023 Apr

REPOSITORIES: biostudies-literature